The minister said if she has information regarding such practice she should contact the Irish Stock Exchange.

"The Irish Stock Exchange investigates suspected insider dealing on the Enterprise Stock Market, being the market on which Siteserv shares traded, and reports any such findings to the Office of Director of Corporate Enforcement. The Department of Finance does not have a role in this process," Mr Noonan said.

Mr Noonan said during his department's review of the Siteserv sale that it was not brought to his or his official's attention that there may have been "questionable share trading activity".

"Neither I nor officials in my Department monitor the share dealing activity in publicly traded companies, including Siteserv," he added.

Siteserv shareholders were paid €5m as part of the sale of the company by the Irish Bank Resolution Corporation (IBRC) to Millington.

The sale of the company resulted in a loss of €105m to the taxpayer and is currently the subject of a review established by the Government in the wake of political pressure over the deal.

However, Mr Noonan said he was assured by IBRC that the deal was the best on offer to the taxpayer.

Taoiseach Enda Kenny has already said the Government is willing to facilitate further reviews into the controversy.